these 20 derivations will be built:
  /nix/store/3ykzm4n1n7iz95wvsqjfx4az6a136gq1-unit-postgresql.service.drv
  /nix/store/r3zr4dvkdzvc3x0l6gcw3j6rwmfgn65a-system-units.drv
  /nix/store/dgpqw7sasqxlygyd232z5bzrzp7dl7cd-etc.drv
  /nix/store/dldz4bin7a8kw1v9p6iiz5a3jhv28n9l-activate.drv
  /nix/store/5hhfbb91q7yb1izkvq5s5ji3gcq3y35w-unit-postgresql.service.drv
  /nix/store/ks0kibvndkd0557k0hh34v846amdyj2c-system-units.drv
  /nix/store/ai04s9wxid05g7cvmn7cmxvbim1jbbvn-etc.drv
  /nix/store/m4d01ypgnjijlsgcs8zs4x8f5drplzc5-activate.drv
  /nix/store/p90ikc1jb02m99gm6l2529f2pfqws263-nixos-system-server-test.drv
  /nix/store/mfkd6am5kn9b6clv35ny2v59wsg29hdl-unit-postgresql.service.drv
  /nix/store/2vxjlh5jl84b1w8g09qshrwlkcaq2iqq-system-units.drv
  /nix/store/4g1ajr7cp4x4xi86kcbyv8azgz1fynyh-etc.drv
  /nix/store/d1lagm2qbb82xdfcjkb2lg5kx4q0pfd3-activate.drv
  /nix/store/zpw9frrb62zh097qdykw3nyn53ccnib5-nixos-system-server-test.drv
  /nix/store/1xxm1sgir1xq7y25r75h53jyr91a1bq2-nixos-system-server-test.drv
  /nix/store/5cw99kv4gk4lqfk6kk9chi49h2r1j3ks-closure-info.drv
  /nix/store/xzhv8qpwp7ix5x4cb8a7gklc1c7lhfsr-run-nixos-vm.drv
  /nix/store/vsmlwc06yynnzd35n2z0v2l679j75mq8-nixos-vm.drv
  /nix/store/n4ajmq8axwv24yi8c7fdrw2a56q87x5d-nixos-test-driver-http.drv
  /nix/store/553a2f0sbvyvwfggxkx71z2mjabj4i58-vm-test-run-http.drv